Question:নিচের কোনটি বীজগণিতীয় সূত্র নয়? 

A `(a + b)^2 = a^2 + 2ab + b^2` 
B `a^2 + b^2 = (a - b)^2 + 2ab` 
C `(x + a) (x + b) = x^2 + (a + b) x + ab` 
D `a^2 - b^2 = (a + b) (a - b)` 

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B 

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Irin Moni

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